Placement of explosive for forming in situ oil shale retort
Process for effecting even retort working fluid flow throughout
Process for forming an in situ oil shale retort
Process for in situ conversion of coal or the like into oil and
Process for production of oil and gas through horizontal drainho
Process for recovering shale oil
Process for recovery of carbonaceous materials from subterranean
Process for recovery of carbonaceous materials from subterranean
Process for the gasification of coal in situ
Production of shale oil by in-situ retorting of oil shale